青岛科技大学  English 
张猛
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硕士生导师  

教师拼音名称:zhangmeng

出生日期:1984-03-15

入职时间:2014-09-10

所在单位:无机非金属材料教研室

学历:博士研究生

性别:男

联系方式:13792436574

学位:工学博士

学科:

材料学

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Temperature-controlled synthesis, thermodynamics and field emission properties of &beta;-SiC/SiO<inf>2</inf>coaxial heterojunction emitters

关键字:Chemical vapor deposition;Electron emission - Field emission - Field emission cathodes - Heterojunctions - Silicon carbide - Temperature - Thermodynamics;Chemical compositions - Chemical vapor depositions (CVD) - Field emission property - Field-emission behavior - Heterojunction emitters - Reaction thermodynamics - Synthesis temperatures - Temperature-controlled synthesis

摘要:&beta;-SiC/SiO<inf>2</inf>coaxial heterogeneous emitters composed of a SiC nanowire core and a uniform amorphous SiO<inf>2</inf>coating have been fabricated via the chemical vapor deposition (CVD) technique. The effect of synthesis temperature on the yield, microstructure, and chemical composition of the products was systematically analysed. A rational explanation for the growth of the &beta;-SiC/SiO<inf>2</inf>emitter was proposed and analysed from the perspective of the reaction thermodynamics. The field emission behaviors of the &beta;-SiC/SiO<inf>2</inf>coaxial nanocables exhibit a strong dependence on the synthesis temperatures. Excellent performances with a low turn-on field (E<inf>to</inf>) of 0.63 V &mu;m<sup>-1</sup>and threshold field (E<inf>th</inf>) of 1.92 V &mu;m<sup>-1</sup>have been recorded at 1200 &deg;C. Furthermore, the optimized cathode shows remarkable electron emission stability with the fluctuation of the current density being less than 5.7% after a 3 h long lifetime test. &copy; 2016 The Royal Society of Chemistry.

卷号:6

期号:61

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